As expected, the Pixel 7a will be powered by the same Tensor G2 chipset found in the mainline Pixel 7 series, alongside 8GB of LPDDR5 RAM and 128GB of (presumably UFS 3.1) storage. It's rocking a 6.1" FHD OLED panel that has finally been upgraded to 90Hz, bringing it closer to competition from Samsung and OnePlus. It's rumored to be powered by a 4,400mAh battery alongside 20W wired charging and — new this generation — wireless charging. It's unclear just how fast the Pixel 7a will charge wirelessly, though early rumors have it pegged at just 5W. Android Police 
Tom's Hardware has a comparison between the Pixel 7 and the planned Pixel 7a.